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Given an integer array nums, return the length of the longest strictly increasing subsequence.A subsequence is a sequence that can be derived from an array by deleting some or no elements without changing the order of the remaining elements. For example,

Given an integer array nums whereevery element appears three times except for one, which appears exactly once. Find the single element and return it.You mustimplement a solution with a linear runtime complexity and useonly constantextra space.Examp...

Given a string s, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.Example 1:Input: s = "A man, a plan, a canal: Panama"Output: trueExplanation: "amanaplanacanalpanama" is a palindrome.Example 2:I.

You are given an array with all the numbers from 1 to N appearing exactly once, except for two number that is missing. How can you find the missing number in O(N) time and O(1) space?You can return ...

Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order.Example 1:Input:[[ 1, 2, 3 ],[ 4, 5, 6 ],[ 7, 8, 9 ]]Output: [1,2,3,6,9,8,7,4,5]...

题目描述Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. Assume that there is only one duplicate numb...

Given a collection of candidate numbers (candidates) and a target number (target), find all unique combinations in candidateswhere the candidate numbers sums to target.Each number in candidatesmay...

题目描述：Tic-tac-toe is playedbytwo players A and B on a3x3grid.Here are the rules of Tic-Tac-Toe:Players take turns placing characters into empty squares (" ").The first player A always plac...

题目描述：Determine whether an integer is a palindrome. An integerisapalindrome when itreads the same backward as forward.Example 1:Input: 121Output: trueExample 2:Input: -121Output: fal...

题目描述Given a 32-bit signed integer, reverse digits of an integer.Example 1: Input: 123 Output: 321Example 2: Input: -123 Output: -321Example 3： ...